Christmas Island

Sonic was born on a small island called Christmas Island. But his love for adventure called him away and he has visited so many different places on Earth that he doesn't really have a place he considers to be home.

Christmas Island (クリスマス島,Kurisumasu tō?) is the place where Sonic the Hedgehog was born.[1][2] It was first mentioned in an "interview" with "Sonic" in issue 7 of Sega of Japan's newsletter magazine SPEC (Sega Players Enjoy Club), published November 1990. In the interview, conducted by Tsukasa Mori (a.k.a. Sakatsu Rimo), Sonic says that he was born on Christmas Island, which he describes as a strange world different from our world, and lives there with his companions.[3][4]

Christmas Island was also mentioned in an 2011 interview with Yuji Naka, conducted by the Russian magazine GameLand (Страна игр). When asked about the presence of humans in Sonic games, Naka said that the action in the Sonic universe began on Christmas Island, which happened to only be inhabited by animals and robots. After a follow-up question, Naka clarified that Christmas Island actually exists and that America performed nuclear weapons tests there, which is the reason they chose to populate it with robots and strange animals.[5] However, the original Sonic the Hedgehog took place on South Island and Christmas Island hasn't been depicted or referenced in any of the video games.